Conditional compilation - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the header file only if DEBUG is defined.

C

#ifdef [1]
#include <stdio.h>
#endif

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ARELEASE

BTEST

CLOGGING

DDEBUG

Attempts:

3 left

💡 Hint

Common Mistakes

Using #ifndef instead of #ifdef

Using a macro name that is not defined

Forgetting to close the #ifdef block with #endif

The #ifdef directive checks if DEBUG is defined before including the code inside.

2fill in blank

medium

Complete the code to define a macro only if it is not already defined.

C

#ifndef [1]
#define [1] 100
#endif

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AMAX_SIZE

BMIN_SIZE

CBUFFER_LEN

DCOUNT

Attempts:

3 left

💡 Hint

Common Mistakes

Defining the macro without checking if it exists

Using a macro name that is unrelated to size

Forgetting to use #endif

The #ifndef directive checks if MAX_SIZE is not defined before defining it.

3fill in blank

hard

Fix the error in the conditional compilation directive to check if VERSION is 2.

C

#if [1] == 2
printf("Version 2\n");
#endif

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A"VERSION"

BVERSION == 2

CVERSION

Ddefined(VERSION)

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'VERSION == 2' inside the #if directive incorrectly

Putting quotes around VERSION

Using defined() when comparing values

Use the macro name VERSION directly in #if to compare its value to 2.

4fill in blank

hard

Fill both blanks to compile code only if FEATURE_X is defined and FEATURE_Y is not defined.

C

#if defined([1]) && !defined([2])
printf("Feature X enabled, Feature Y disabled\n");
#endif

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AFEATURE_X

BFEATURE_Y

CDEBUG

DRELEASE

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the feature names in the conditions

Using defined() incorrectly

Forgetting the negation operator !

Use defined(FEATURE_X) and !defined(FEATURE_Y) to check the conditions correctly.

5fill in blank

hard

Fill all three blanks to define a macro VALUE as 10 if MODE is 1, else 20.

C

#if [1] == 1
#define VALUE [2]
#else
#define VALUE [3]
#endif

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AMODE

B10

C20

DVALUE

Attempts:

3 left

💡 Hint

Common Mistakes

Using VALUE instead of MODE in the condition

Swapping the values 10 and 20

Forgetting to use #define

Check if MODE equals 1, then define VALUE as 10, else define it as 20.